﻿/*                       NOTICE
 * 
 * This software was produced for the U. S. Government
 * under Contract No. FA8721-10-C-0001, and is
 * subject to the Rights in Noncommercial Computer Software
 * and Noncommercial Computer Software Documentation Clause
 * (DFARS) 252.227-7014 (JUN 1995)
 * 
 * Approved for Public Release: 11-2435
 * © 2011 The MITRE Corporation. All Rights Reserved. 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;
using Microsoft.Xna.Framework;

namespace MXSE.MultiTouch.Gestures
{
    public class DragGesture : BasicGesture
    {
        //Stores the last significant change to the position.
        //Used to determine the direction the slide is moving in.
        public Vector3 lastChange;

        public DragGesture(TouchGesture touchGesture)
        {
            Parent = touchGesture.Parent;
            startPosition = touchGesture.currentPosition;
            startTime = DateTime.Now;
            currentPosition = startPosition;
            lastPosition = startPosition;
            Id = touchGesture.Id;
        }

        public DragGesture(SlideGesture slideGesture)
        {
            //Parent = slideGesture.Parent;
            startPosition = slideGesture.currentPosition;
            startTime = DateTime.Now;
            currentPosition = startPosition;
            lastPosition = startPosition;
            Id = slideGesture.Id;
            speed = slideGesture.speed;
        }

        public override void Start()
        {
            contactManager.recognizer.publishMessage(
                "Starting drag " + Id + " at " + currentPosition.X + ", " + currentPosition.Y,
                "DragStart",
                Id,
                startPosition.X, startPosition.Y,
                lastPosition.X, lastPosition.Y,
                currentPosition.X, currentPosition.Y
            );
        }

        public override void Update()
        {
            base.Update();
            if (Parent == null)
                if (contactManager.getDistance(lastPosition, currentPosition) > 0)
                    contactManager.recognizer.publishMessage(
                        "Drag " + Id + " moved to " + currentPosition.X + ", " + currentPosition.Y,
                        "DragChange",
                        Id,
                        startPosition.X, startPosition.Y,
                        lastPosition.X, lastPosition.Y,
                        currentPosition.X, currentPosition.Y
                    );
        }

        public override void OnDeath()
        {
            contactManager.recognizer.publishMessage(
                "Drag " + Id + " ended.", 
                "DragEnd", 
                Id, 
                startPosition.X, startPosition.Y, 
                lastPosition.X, lastPosition.Y, 
                currentPosition.X, currentPosition.Y
            );
        }
    }
}
